When the house stands at the back of the plot with a garden in front, which centre is used to map the devtas?
Take the centre of the whole plot and map the devtas on it; all the open land around the house, even outside the building, becomes space for the devtas. This is why big houses abroad, as in America, are so balanced: about 4,000 sq ft is built on about 40,000 sq ft of land, so the 32 outer devtas get a huge, open pishach bhoomi and the manushya and dev bhoomi get cross ventilation from all sides. Just as a person given two acres of land enjoys the space, the devtas are pleased by big open land.
Related questions
Why is there no line between manushya bhoomi and dev bhoomi on the 81-pada devta map?
In today's 81-pada vastu the manushya and dev bhoomi are combined, so only three divisions remain: the pishach bhoomi with the 32 outer devtas, the combined manushya-dev bhoomi with 12 devtas, and the brahma bhoomi with Brahma. After dividing the plan with the 0.33, 0.55 and 0.77 multipliers, erase the middle line between manushya and dev bhoomi, since it is not needed for placing the devtas.
Are the 32 outer devtas drawn in the Manushya bhoomi or in the Pishach bhoomi?
In the Pishach bhoomi, the outermost band. The 32 outer devta lines are drawn only within the Pishach bhoomi, while the 12 inner devtas sit in the combined Manushya and Dev band and Brahma in the centre.
Does the centre taken from the boundary wall also decide where on the plot to construct?
Where to construct is taught later; for example, on a North-facing plot the building is placed in the South and West part. The pishach bhoomi is always left open on all sides. People abroad leave space all around and keep large backyards and live prosperously, while many people here leave no space at all for energy to come in.
Houses abroad have back doors opening into the garden that do not lead to the road; do these bad entries need treatment?
Such a door is not counted as an entry; it is a prishth bhang dwar (rear door) that lets the negative energy of the house out. Energy enters with you through the door you come in by. No treatment is needed; if it bothers you, draw the energy-blocking swastik. Symbol vastu especially suits countries outside India, where demolition is not possible.
How are the 0.333, 0.555 and 0.777 bhoomi ratios derived?
In the 81 pad grid the line from the centre to a corner is 4.5 boxes long. From the centre, Brahma bhoomi ends at 1.5 boxes, Dev bhoomi at 2.5 and Manushya bhoomi at 3.5, and Pishach bhoomi runs to 4.5. Dividing by 4.5 gives 0.333, 0.555 and 0.777, which are applied to the real length of each centre-to-corner line on the map.
How are the 64 pad grid and the padas of each devta worked out?
Every pad grid divides the plot into equal sections, for example 81 equal sections for the 81 pad grid; the number of padas each devta occupies is then assigned within that grid. Drawing the devtas by hand will be taught practically in the 81 pad class.